Nubank Hackerrank challenge solution ~ ASCII to Text

nubank-hackerrank-challenge.js

const getCurrentCharValue = (str, startIndex, endIndex) => {
  const currentValueToDecode = str.substring(startIndex, endIndex);
  const currentValueToDecodeInt = parseInt(currentValueToDecode);

  return String.fromCharCode(currentValueToDecodeInt);
}

const getCurrentIndexJump = (value) => {
  if (value === 32) {
    return 1;
  }

  if (value >= 65 && value <= 90) {
    return 2;
  }

  if (value >= 97 && value <= 122) {
    return 3;
  }

  return 0;
}

function decode(encodedString) {
  // Write your code here
  const revertedEncodedString = encodedString.split("").reverse().join("");

  let revertedEncodedStringLength = revertedEncodedString.length;
  let decodedString = '';

  let startIndexToDecode = 0;
  let endIndexToDecode = 0;

  let currentValueToDecode = revertedEncodedString.substring(startIndexToDecode, endIndexToDecode);
  let currentValueToDecodeInt = parseInt(currentValueToDecode);

  while (endIndexToDecode !== revertedEncodedStringLength + 1) {
    currentValueToDecode = revertedEncodedString.substring(startIndexToDecode, endIndexToDecode);
    currentValueToDecodeInt = parseInt(currentValueToDecode);

    if (getCurrentIndexJump(currentValueToDecodeInt) === 0) {
      endIndexToDecode += 1;
    } else {
      if (getCurrentIndexJump(currentValueToDecodeInt) === 1) {
        decodedString += getCurrentCharValue(revertedEncodedString, startIndexToDecode, endIndexToDecode);
        startIndexToDecode = endIndexToDecode;
      } else if (getCurrentIndexJump(currentValueToDecodeInt) === 2) {
        decodedString += getCurrentCharValue(revertedEncodedString, startIndexToDecode, endIndexToDecode);
        startIndexToDecode = endIndexToDecode;
      } else if (getCurrentIndexJump(currentValueToDecodeInt) === 3) {
        decodedString += getCurrentCharValue(revertedEncodedString, startIndexToDecode, endIndexToDecode);
        startIndexToDecode = endIndexToDecode;
      }
    }
  }

  return decodedString;
}